DM133

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

16-Bit Constant Current LED Drivers

-10-

Version

：A.024

3)Serial_Out Timing Selection

The SERIAL_OUT output timing can be changed by the level of SOMODE. When

SOMODE is set high, data is shifted out on synchronization to the falling edge of

CLOCK, and when SOMODE is set low, data is clocked out to SERIAL_OUT

synchronized on the rising edge of CLOCK.

The graph below depicts the timing of data serial-in and serial-out.

4)Thermal Alarm

The open-drain ALARM pin will go low when the IC junction temperature is

approximately above 150℃. As the thermal alarm is issued, the system should cool

down the temperature (by lowering the PWM current output, or by turning on the fan

system, …etc.).

The ALARM pin will return to high when the IC junction temperature is approximately

below

100℃ or when the power is turned on again after turned off for several seconds.

Operation in a thermal alarm situation for long time may cause permanent damage to

the IC.

CLOCK

SERIAL_IN

LATCH

ENABLE

OUT0

OUT1

OUT2

OUT3

OUT13

OUT14

OUT15

5V

0V

5V

0V

5V

0V

5V

0V

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

SOMODE

5V

0V

5V

0V

SERIAL_OUT

Previous Data

16 Clocks

DATASEL

5V

0V